【已解决】JS中获取当前时间之前或之后几个小时的时间

搜：

js date sub hour

参考：

javascript – How to subtract 2 hours from user’s local time? – Stack Overflow

How do I subtract minutes from a date in javascript? – Stack Overflow

datetime – Adding hours to Javascript Date object? – Stack Overflow

去试试

let curAlarmDate = timestampToDate(current_date);

console.log(`curAlarmDate=${curAlarmDate}`);

let tmpPrevDate = curAlarmDate;

let tmpNextDate = curAlarmDate;

let preFiveHoursDate = tmpPrevDate.setHours(tmpPrevDate.getHours() – 5);

let nexSevenHoursDate = tmpNextDate.setHours(tmpPrevDate.getHours() + 7);

console.log(`preFiveHoursDate=${preFiveHoursDate},nexSevenHoursDate=${nexSevenHoursDate}`);

另外，再去把date转换为时间戳。

对于上述的内容，不够好，没有集成到Date对象中，自带此功能。

【总结】

最后改为：

// 对Date的扩展，返回之前或之后的多少个小时的时间

// 例子：

// (new Date()).prevNextHours(5) / (new Date()).prevNextHours(-7)

// ==>

// current date [Tue Jun 06 2017 08:00:00 GMT+0800 (CST)] + [7] hours -> [Tue Jun 06 2017 15:00:00 GMT+0800 (CST)]

Date.prototype.prevNextHours = function (hoursNumber) {

console.log(`Date prevNextHours: this=${this}, hoursNumber=${hoursNumber}`);

// Note: here only got date pointer(reference) not date value, so later setHours will change this !!!

// let tmpDate = this;

let tmpDate = new Date(this);

let changedDateTimestamp = tmpDate.setHours(tmpDate.getHours() + hoursNumber);

console.log(`changedDateTimestamp=${changedDateTimestamp}`);

let changedDate = new Date(changedDateTimestamp);

console.log(`current date [${this}] + [${hoursNumber}] hours -> [${changedDate}]`);

return changedDate;

};

调用：

let curAlarmDate = timestampToDate(current_date);

console.log(`current_date=${current_date} -> curAlarmDate=${curAlarmDate}`);

// let tmpPrevDate = curAlarmDate;

// let tmpNextDate = curAlarmDate;

// let preFiveHoursDate = tmpPrevDate.setHours(tmpPrevDate.getHours() – 5);

// let nexSevenHoursDate = tmpNextDate.setHours(tmpPrevDate.getHours() + 7);

let preFiveHoursDate = curAlarmDate.prevNextHours(-5);

let nexSevenHoursDate = curAlarmDate.prevNextHours(+7);

console.log(`preFiveHoursDate=${preFiveHoursDate},nexSevenHoursDate=${nexSevenHoursDate}`);

效果：

Date prevNextHours: this=Tue Jun 06 2017 08:00:00 GMT+0800 (CST), hoursNumber=7

VM10267:65 changedDateTimestamp=1496732400000

VM10267:68 current date [Tue Jun 06 2017 08:00:00 GMT+0800 (CST)] + [7] hours -> [Tue Jun 06 2017 15:00:00 GMT+0800 (CST)]

index.js?7def:469 preFiveHoursDate=Tue Jun 06 2017 03:00:00 GMT+0800 (CST),nexSevenHoursDate=Tue Jun 06 2017 15:00:00 GMT+0800 (CST)

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【已解决】JS中获取当前时间之前或之后几个小时的时间

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